Improvement in sawing-machines



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JAMES n. oURELL, or sir. Louis, Missonni, AssrcNoR To HIMsnLr Avn JEREMIAH E. Monnisnr, or sAMnfrLAon.

Letters Patent No. 108,886, dated November 1, 1'870.

IMPROVEMENT IN sAwlNe-MAcHlNss.'

The Schedule referred to in these Letters Patent and making part of lthe same.

' LIJAMES H. GURELL, of St. Louis, in the county of St. Louis and State of Missouri, have invented a certain Adjustable sawing-Machine, of which the following is a specification.

Nature and Object of the Invention.

justed to any angle.

The saw is driven by a belt that isso arranged that j nor the neither the vertical adjustment of the saw horizontal movementof the carriage will loosen or tighten the belt.

'The draw-ing is a perspective view of my machine.`

General Description.

A is the supporting-frame, and

B, the table upon which the stu" is laid.

C is the lixed bar of a parallelfence orgauge, and

C is the adjustable bar of' the. same.

c are links connecting vthe bars `G G and serving to secure their parallelism inv-all positions of the bar C'.

D is a.. link, which is pivoted to the' bar C and slides upon the bar C.

This link has a slot, dwhich receives a set-screw, d', (attending.` upward from the barfC, and fitted. with a thumb-nut, d", which is turned down upon the link to hold the bar C' at the proper distance from that C. E is a post, which is firmly fixed to the frame.

F F' are brackets attached tothe post E, giving bearing to the turn-post G, which is stepped in the table B.

H is a horizontal platform attached to the turnpostG.

I is a slide-plate attachedy tothe top of thc plat ferm, and having beveled edges, which are embraced by the edges of the base-plate J of thesaw-carriage, which slides freely upon the plate I.

K is a standard-frame having curved out-turned edges, k, which are embraced by vthe edges of the journal-blocks L L' of the saw-mandrel The journal-'blocks L L' are connected by acrossbar, l, in which turis the end ofa screw, l', by the turning-of which the saw N is adj usted vertically.

The. screw l is turned by a handcrank, 1,.aud turns in a screw-threadedhole at the mid-length of the bar 0, which is pivoted at the ends to allow of its turning as the screw is raised or lowered.

P is a handle, by which the carriage may be moved along the slide-plate I.

Upon the mandrel M is a pulley, an, turned by a belt, Q, that passes from the pulley m, beneath rol1- ers m m, journaled in standards jj' at the rear end of the base-plate of the carriage.

From the rollers m "m" the 'belt passes around two rollers or pulleys R R', which 'are journaledin bars r r' pivoted at the free ends of the rodsS S S S, the other ends of the rods S S being pivoted to the standards j j, and of the rods or frame S S to the shaft T.

' From the pulleys 1t R' the belt passes around a pulley, t, upon the shaft T..

y This shaft, at one end, is jonrnaled upon a pedestal upon the platform H, its other end being journaled in the forked end y of the turn-'post G; and the latter end of theshaft carries a pulley,`V, whose belt-'v extends around a pulley ovcrhead, from which the ma.-v

chine neceives its motion. p

The irollers or pulleys R It are journaled in pivoted bars, as shown, to allowvthe rollers tochange their relative positions as they are lowered or raised by the i movement of the carriage, so that their axes will always be in a plane which, being` extended, would pass nearly midway between the rollers m' alu/and the shaft T, thus enabling the perfect operation ofthe device, namely, tlxc non-stretching of the belt in the back-v ward movement of the carriage.

XV is a curved slot passing through the table, and equidistant, from end to end, from the turn-post G.

This slot is traversed by a bolt, X, which passes upward through` the platform, and has a hand-nut, x,

above the platibrm, and a thick washer or loose collar between theplatiorm and the table, so that the platform may be rigidly held in the requipcd `position by tightening of thc hand-nut. e

The slides l.; have thc form of arcs of circles whose centers are between the axes of the rollers m' m", so

thatV the raising or lowering of the saw will not affect the tightness of the belt Q. Neither is the tightness of the belt affected by the sliding of the carriage J, as the rods S S are pivotcd to a point of the standards y' j', between the axes of the rollers m r11/,and the rods or frame S Sf" pivoted on the shaft T, so that the rollers It 1t' are always the same distance from the pulley tand rollers 'm' m".

The machine is 'intended more especially for Yuse in themanufitcture oi' front and back strings of stairs, in cutting ont the 'dadocs or gains which receive the ends of the steps and riscrsf but the application of the. machine is very wide, for cutting niiters, &c.

A portion of the table may be :made vertically adjustable for stuff of different thickness.

The operation is as follows:

The stuff is placedv upon the table with one edge against the fence o'r gauge C', and the saw being adjusted to the proper ang-le is drawn forward and cuts a -horizontal kerf of any requirel'depth.

In cutting dado'es (as in stair-strings or curved topv pieces of window-frames or sash) two outside cuttingsaws, and one or more'clcaring-saws, between them,

are placed on the mandrel, so as to cnt ont the whole gain or dado at one passage of the saws.

Claims.

I claim as my nventionv l. The horizontally-sliding saw-carriage, supported on a turwpost, G, substantially as and for the purpose described. v

2. In combination with the carriage J, the standards jj' and 7.: k, and journal-blocks L L', allowing the `vertical adjustment of the saw without affecting the length of the belt, as described.

3. The combination of the rollers m m", R R', pnlley t, rods S S S" S, and belt Q, so connected and arranged as to permit the movement "of the saw-ear riage J without affecting the tightness of the belt, substantially as shown and described.

4. The combination of the turn-post G y, platform H, shaft T, and pulley V, substantially as described,

and for the purpose set forth.

5. The combination of the turn-liest G, platform H, set-screw X x, table B, and slot W, as and for the purpose described.

In testimony of which invention I hereunto set my hand.

JAMES H. CURELL.

Witnesses i SAML. KNIGHT,

STEPTI. BERNARD. 

